AT24C02的I2C实验.此实验为AT2402实验。从地址0x80开始写入0到9，然后再从AT24C02中读入，把读取的数据 发往串口。-The I2C AT24C02 experiment. This experiment AT2402 experiments. Starting from address 0x80 write 0 to 9, and then reads from the AT24C02 to read data sent to the serial port.